Playstation Network Game Question?

hey everyone, well i recently bought a few games on the playstation network for my psp slim, and am wanting to buy another, so i was going to delete one to make room to download it, my question is…if i delete one of the games off my memory stick can i re-dowload it at a later date and if so is there a limit to how many times it can be downloaded or is it limitless?

thanks

Suggestion:

use media go and transfer to back to your pc , you have to be online to do this , then you can transfer it back to your Memory stick some other day , best thing to do is get a bigger Memory stick like 8gig